. >>> a serious accusation rocking the sports world this morning. two former nfl stars, tim brown and jerry rice, are accusing their former coach of sabotaging the super bowl. rice and brown claim that coach bill callahan, changed the raiders' game plan at the last minute to help his friend, opposing coach jon gruden, win. he calls it ludicrous. >>> serena williams showed her frustration with the rackets and she also suffered a back injury, her first loss in 20 matches. if you're going to throw it away, we'll take the racket. put it up next to pete townsend's smashed guitar. but she'll bounce back. >>> but the raiders story, you were shaking your head? >> why would he want to help his friend rather than win it himself? >> rich gannon, who was the quarterback, said that wasn't the case. they didn't change the verbiage at the line of scrimmage so the other team knew what was coming. >> it took ten years for this to come out. >>> now to beyonce, the superstar remaining quiet right now. abc's david wright has the story on all the sound and the silence. good morning, david. >> reporter: morning, amy.